"many singers don't know how awful they are. Reasons range from narcissism, with its ego-inflated self-absorption, to an obsession with fame.

'The very narcissistic honestly believe they are awesome even when there's no evidence' of it, says Dave Verhaagen, a Charlotte psychologist and author of Parenting the Millennial Generation. And he says that research suggests people who perform worst at a task often rate themselves best as a means of self-defense."